Well I love Tilly's, or at least the style. It's right up my alley. BUT, my only two experiences with this store have been less than pleasant. First I bought a pair of jeans in the store (which by the way were REALLY expensive), they were okay, lasted me about a year. The only thing was the legs were too long and the waist barely reached my actual waist. The second time I ordered three pairs on line. Two out of three of them didn't fit me. The two that didn't were so weird, the waist was really big while the legs fit just fine. Tried to fix it with a belt but it didn't exactly work out. And also, I'm a size small in jeans and pants but when I tried on the pants in the store I was like a five and it didn't even fit that well (I already mentioned how the leg to waist ratio was way off).
Anyway, the style might be cute but it's so not worth the hassle. Yikes, I would steer clear of this store no matter how amazing the clothes may look.